Related Clues:

• Cause ennui
• Demonstrate boredom
• Yawn inducer
• [Ho-hum]
• Barrel measure
• Hint to an unexciting speaker
• Put to sleep, maybe
• Tire
• Resident of Dullsville
• Sign from the bored
• Yawner
• Hardly the life of the party
• Sign of boredom
• Hollow out
• Dullard